JP6797580B2 - Manufacturing method of powdered cosmetics - Google Patents

Description

The present invention relates to a method for producing powdered cosmetics.

Powdered cosmetics are manufactured by mixing powder and oily components, crushing the mixture with a crusher such as a palperizer, filling it in a metal or resin inner plate, or further dry press molding. A method called a dry manufacturing method has been adopted and manufactured.
On the other hand, according to the dry manufacturing method, characteristics such as usability are not sufficient, so for the purpose of improving the characteristics, powder and oily components are added to a volatile solvent to prepare a slurry, and the slurry is placed in a container in the state of the slurry. A method called a wet production method has been proposed in which the container is filled and then the solvent is removed by vacuum suction or the like to solidify the powder.

As mentioned above, the dry method leaves room for improvement in the usability when applied to the skin, and the wet method leaves room for improvement in the solid cosmetics becoming too hard to be removed into the puff. The method also required improvements in order to obtain a satisfactory solid cosmetic product.

In response to the above problems, paying attention to the process of drying the slurry in the wet manufacturing method, the slurry is made into fine droplets by a mechanical shearing force, and the drying gas is sent to the fine droplets to dry the slurry and feel the use. And a method for obtaining a powdered cosmetic having excellent usability is disclosed (see Patent Document 1).
Further, in the wet manufacturing method, by setting the blending amount of the powder, the oily component and the water in the slurry within a specific range, the oily component can be uniformly and efficiently adhered to the surface of the powder, and the usability and usability A method for obtaining a powder solid cosmetic having both impact resistance is disclosed (see Patent Document 2).

Japanese Unexamined Patent Publication No. 2007-055990 JP 2015-000855

As described in Patent Documents 1 and 2, attempts have been made to achieve both a feeling of use when applied to the skin in a wet manufacturing method and usability such as a degree of removal to a puff and drop strength. Another object of the present invention is to provide a method for producing a powder cosmetic product, which can achieve both a feeling of use when applied to the skin and usability such as a degree of removal to a puff and a drop strength in a wet production method. ..

Similarly, the present inventors have diligently studied to obtain a powder cosmetic having both a feeling of use and usability, and found that even if the powder is dispersed in the oil in the state of primary particles in the slurry state, the drying step It was found that the powders reaggregate due to the close proximity of the powders and the powder surface is not uniformly coated with oil. Based on this knowledge, we repeated studies and came up with the idea that reaggregation of powder can be suppressed by making the particle size of the dried powder fine when the slurry is dried in the drying step. After repeated studies to make the particle size of the dry powder fine, it was found that an extremely fine dry powder can be obtained by spraying the mist of the slurry with a sprayer and drying the sprayed mist.

The present invention includes:
(1) A slurry preparation step of mixing at least powder and an oily component in a solvent to prepare a slurry, and spraying the mist of the prepared slurry with a sprayer and drying the sprayed mist to dry particles. A method for producing powdered cosmetics, which comprises a spray drying step.
(2) The method for producing powder cosmetics according to (1), wherein the sprayer used in the spray drying step includes a nozzle and sprays mist from the tip of the nozzle.
(3) The method for producing a powder cosmetic according to (1) or (2), wherein the powder contains at least a spherical powder.
(4) The method for producing a powder cosmetic according to (1) or (2), wherein the powder contains at least a composite powder in which fine particles are arranged around a plate-shaped powder.
(5) The method for producing powdered cosmetics according to any one of (1) to (4), wherein the medium diameter D _{50 of the} dried particles obtained in the spray drying step is 20 μm or less.
(6) The method for producing powdered cosmetics according to any one of (1) to (5), further comprising a molding step of filling a mold with the dried particles obtained in the spray drying step and molding the mold.
(7) The method for producing a powdered cosmetic according to any one of (1) to (6), wherein the powdered cosmetic is loose powder.
(8) The method for producing a powdered cosmetic according to any one of (1) to (6), wherein the powdered cosmetic is a pressed powder.
(9) A loose powder containing at least fine particles having an average particle diameter of 10 μm or less and a loose powder containing an oily component having a medium diameter D ₅₀ of 20 μm or less.
(10) A powder containing at least fine particles having an average particle diameter of 10 μm or less, and a pressed powder containing an oily component.
Of the pressed powder scraped off by the puff, the pressed powder having a medium diameter D _{50 of} 250 μm mesh pass pressed powder of 20 μm or less.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a powder cosmetic that has both a feeling of use when applied to the skin and usability. Furthermore, since the surface of the powder is uniformly coated with oil to prevent aggregation, it is possible to maximize the functions of the powder, and cosmetics containing fine particle titanium oxide, fine particle zinc oxide, etc. The SPF value can be improved with the agent and the cosmetic containing the composite powder in which the fine particles are arranged around the plate-shaped powder.
Further, in the wet manufacturing method, the ultraviolet absorber tends to be sucked together at the time of vacuum suction, and it is difficult to improve the SPF value. However, in the present invention, the effect of the SPF value by adding the ultraviolet absorber is sufficient. Played by.

It is a figure which shows the particle size distribution of the dry powder produced in Example 1. It is a figure which shows the particle size distribution of the dry powder produced in Example 4. It is sectional drawing which shows the tip of the nozzle of the atomizer which can be used for the spray drying process in this embodiment.

Hereinafter, a method for producing a powdered cosmetic according to an embodiment of the present invention will be described, but the technical scope of the present invention is not limited to the following specific embodiments.

The method for producing powdered cosmetics according to the present embodiment is a slurry preparation step of mixing at least powder and an oily component in a solvent to prepare a slurry, and spraying the mist of the prepared slurry with a sprayer. It is a method for producing powdered cosmetics, which comprises a spray drying step of obtaining dry particles by drying the mist. Further, it may further have a recovery step of recovering the dried particles obtained in the spray drying step, and further has a molding step of filling the mold with the dried particles obtained in the spray drying step and molding the dry particles. May be good.

<Slurry preparation process>
The slurry preparation step is a step of preparing a slurry by mixing at least a powder and an oily component in a solvent. When preparing the slurry, components other than the powder and the oily component necessary for the preparation of the cosmetic can be appropriately added.

1) Powder The powder that can be used in the present embodiment is a general term for organic or inorganic solid materials that are insoluble in cosmetic raw materials such as water, fats and oils, surfactants, alcohols, and silicones.
Specific examples of the powder include kaolin, talc, mica, sericite, titanium mica, laminated resin small pieces (glitter), Ca / Al borosilicate, titanium sericite, titanium dioxide, iron oxide, zinc oxide, ultramarine blue, dark blue, Red No. 102, Red No. 226, Yellow No. 4 Aluminum lake, silica, alumina, calcium silicate, magnesium silicate, calcium carbonate, magnesium carbonate, methylsiloxane reticulated polymer, crosslinked methylpolysiloxane resin, alkylacrylate resins, nylon , Silk, calcium or a composite material thereof and the like can be exemplified.
The shape of the powder may be spherical, amorphous, porous, hollow, fibrous, plate-like or lumpy. Further, the surface thereof may be subjected to a commonly known surface treatment such as a silicone coating treatment, a metal soap coating treatment, and an acylamino acid salt coating treatment.

As the powder, only one kind may be blended in the slurry, or two or more kinds may be blended in combination.
In the present embodiment, the content of the powder is usually 70% by mass or more, preferably 75% by mass or more, more preferably 80% by mass or more, and 85% by mass or more in the powder cosmetics. Is more preferable. Further, it is usually 98% by mass or less, and preferably 95% by mass or less.

In the present embodiment, fine dry powder can be obtained by a spray drying step as described later. Therefore, it can be applied particularly preferably when the fine particle powder is contained, the scattering effect of the fine particle powder can be sufficiently exhibited, and the SPF value is improved. Further, when the spherical powder is contained, it can be preferably applied to the case where the composite powder in which fine particles are arranged around the plate-shaped powder is contained.

Spherical powders include organic spherical resin powders such as nylon, styrene, methyl methacrylate, polymethylsilsesquioxane powder, and organopolysiloxane elastomer powder, and inorganics such as silica, alumina, titanium oxide, magnesium carbonate, and calcium silicate. Spherical powders and the like are exemplified, and these spherical powders are preferably 3% by mass or more, more preferably 5% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less, based on the total amount of the powder. By blending, it becomes possible to maintain the drop strength while improving the usability such as spreading and spreading, and the caking property is also improved.
The average particle size of the spherical powder is usually 1 μm or more, preferably 3 μm or more, and usually 50 μm or less, preferably 30 μm or less, from the viewpoint of usability such as elongation and spread. The spherical powder may be surface-treated by a known method for the purpose of improving dispersibility, adhesiveness, and the like. The surface treatment may be a hydrophobic treatment or a hydrophilic treatment depending on the purpose.

Examples of the composite powder in which fine particles are arranged around the plate-shaped powder include SMT-57S (manufactured by Teika Co., Ltd.), and these composite powders are preferably 4% by mass or more based on the total amount of the powder. By blending more preferably 6% by mass or more, preferably 30% by mass or less, and more preferably 25% by mass or less, the drop strength can be improved and the SPF value can be improved without causing caking property.

Examples of the fine particle powder include fine particle titanium oxide and fine particle zinc oxide, which are referred to as fine particles having an average particle diameter of 10 μm or less, and may be 1 μm or less, 500 nm or less, and 100 nm or less. Good. The drop strength is increased by blending the fine particle powder with respect to the total amount of the powder, preferably 0.5% by mass or more, more preferably 5% by mass or more, and preferably 20% by mass or less, more preferably 15% by mass or less. It is improved, the caking property is improved, the SPF value is improved, and the transparency is not impaired when applied to the skin.

As described above, according to the present embodiment, even if the powder is fine particles, the surface of the powder is uniformly coated with oil and aggregation can be prevented, so that the function of the powder can be maximized. It will be possible.
The powder may be blended only in one type or in combination of two or more types.
In the present embodiment, the content of the powder is usually 65% by mass or more, preferably 70% by mass or more, more preferably 75% by mass or more, and 80% by mass or more in the powder cosmetics. Is more preferable. Further, it is usually 95% by mass or less, preferably 90% by mass or less, and more preferably 85% by mass or less.

2) Oily component Specific examples of the oily component that can be used in the present embodiment include macadamia nut oil, avocado oil, corn oil, olive oil, rapeseed oil, sesame oil, castor oil, saflower oil, cottonseed oil, jojoba oil, palm oil, and the like. Animal and vegetable oils such as palm oil and liquid lanolin; hydrocarbon oils such as liquid paraffin, squalane and pristane; liquid fatty acids such as oleic acid and isostearic acid; liquid higher alcohols such as isostearyl alcohol and octyldodecanol; cetyl isooctanoate and myristine Isopropyl acid, hexyldecyl isostearate, diisopropyl adipate, di-2-ethylhexyl sebatate, cetyl lactate, diisostearyl malate, ethylene glycol di-2-ethylhexaneate, neopentyl glycol dicaprate, di-2-heptyl Glycerin undecanoate, Glycerin tri-2-ethylhexanoate, Cetyl ethylhexaneate, Trimethylolpropane tri-2-ethylhexaneate, Trimethylolpropane triisostearate, Pentaneritrit tetra-2-ethylhexaneate, Glyceryltriiso Synthetic ester oils such as stearate and glyceryl triisooctanate; chain polysiloxanes such as dimethylpolysiloxane, methylphenylpolysiloxane, and diphenylpolysiloxane; octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecamethylcyclohexanesiloxane, etc. Cyclic polysiloxane; silicone oil such as modified polysiloxane such as amino-modified polysiloxane, polyether-modified polysiloxane, alkyl-modified polysiloxane, and fluorine-modified polysiloxane; However, those belonging to the specific surfactant group described later shall not be treated as oily components.

Only one type of oily component may be blended, or two or more kinds may be blended in combination.
When the oily component is blended in the present embodiment, it is usually 5% by mass or more, preferably 10% by mass or more in the cosmetic. Further, it is usually 25% by mass or less, and preferably 20% by mass or less.

3) Solvent The solvent may be any solvent usually used for preparing a slurry. Examples thereof include purified water, volatile silicone oils, lower alcohols, ethers, volatile hydrocarbon oils, pyrrolidones, and the like. Further, these may be mixed and used.
The amount of the solvent may be an amount sufficient to mix the powder and the oily component, and usually the powder 10
Use 50 parts by mass or more and 200 parts by mass or less with respect to 0 parts by mass.

4) Others The powder cosmetics produced in the present embodiment can widely contain ingredients usually used in powder cosmetics.

For example, examples of the active ingredient include a whitening ingredient, an anti-inflammatory ingredient, a plant extract and the like.
Examples of the surfactant include fatty acid surfactants (sodium laurate, sodium palmitate, etc.), anionic surfactants such as potassium lauryl sulfate and triethanolamine alkyl sulfate ether, stearyltrimethylammonium chloride, benzalkonium chloride, and lauryl. Cationic surfactants such as amine oxide,
Betaine-based surfactants (alkyl betaine, amide betaine, sulfobetaine, etc.), imidazoline-based amphoteric tenside agents (2-cocoyl-2-imidazolinium hydroxide-1-carboxyethyroxy disodium salt, etc.), acylmethyltaurine Etc. amphoteric surfactants,
Sorbitane fatty acid esters (sorbitan monostearate, sorbitan sesquioleate, etc.), glycerin fatty acids (glycerin monostearate, etc.), propylene glycol fatty acid esters (propylene glycol monostearate, etc.), hardened castor oil derivative, glycerin alkyl ether , POE sorbitan fatty acid esters (POE sorbitan monooleate, polyoxyethylene sorbitan monostearate, etc.), POE sorbit fatty acid esters (POE-sorbit monolaurate, etc.), POE glycerin fatty acid esters (POE-glycerin monoisosteer, etc.) Rate, etc.), POE fatty acid esters (polyethylene glycol monoolate, POE distearate, etc.), POE alkyl ethers (POE2-octyldodecyl ether, etc.), POE alkylphenyl ethers (POE nonylphenyl ether, etc.), pluronic types, POE -POP alkyl ethers (POE / POP2-decyltetradecyl ether, etc.), tetronics, POE castor oil / cured castor oil derivatives (POE castor oil, POE cured castor oil, etc.), sucrose fatty acid esters, alkyl glucosides, etc. Examples thereof include nonionic surfactants.

Polyhydric alcohols include polyethylene glycol, glycerin, 1,3-butylene glycol, erythritol, sorbitol, xylitol, martitol, propylene glycol, dipropylene glycol, diglycerin, isoprene glycol, 1,2-pentanediol, 2,4. -Hexylene glycol, 1,2-hexanediol, 1,2-octanediol and the like can be mentioned.

Thickeners include guagam, chitin seed, carrageenan, galactan, arabic gum, pectin, mannan, starch, xanthan gum, curdlan, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, methylhydroxypropylcellulose, chondroitin sulfate, dermatane sulfate, glycogen, Heparan sulfate, hyaluronic acid, sodium hyaluronate, traganth gum, keratin sulfate, chondroitin, mucoitin sulfate, hydroxyethyl guagam, carboxymethyl gua gum, dextran, kerato sulphate, locust bean gum, succinoglucan, carronic acid, chitin, chitosan, carboxymethyl Examples thereof include chitin, agar, polyvinyl alcohol, polyvinylpyrrolidone, carboxyvinyl polymer, alkyl-modified carboxyvinyl polymer, sodium polyacrylate, polyethylene glycol, bentonite and the like.

Examples of UV absorbers include paraaminobenzoic acid UV absorbers, anthranylic acid UV absorbers, salicylic acid UV absorbers, cinnamic acid UV absorbers, benzophenone UV absorbers, sugar UV absorbers, 2- (2). Examples thereof include UV absorbers such as'-hydroxy-5'-t-octylphenyl) benzotriazole and 4-methoxy-4'-t-butyldibenzoylmethane.

The method of slurrying in the slurry preparation is not particularly limited, and a known method can be used. For example, a powder and an oily component, and if necessary, other components are added to the solvent, and the mixture is mixed and stirred using a disper mixer, a homogenizer, a planetary mixer, a stirring mill, or the like to form a slurry.

<Spray drying process>
The spray drying step is a step of spraying the mist of the prepared slurry with a sprayer and drying the sprayed mist to obtain fine particles of dry powder.
The sprayer is not limited as long as the slurry can be mistened and sprayed, and an existing sprayer can be applied. In the present embodiment, it is preferable that the sprayer has a nozzle and sprays the mist from the tip of the nozzle because the mist can be easily dried in the subsequent drying step and can be easily recovered.
An example of a nozzle capable of mistizing and spraying the slurry will be described with reference to FIG. The shape of the nozzle is not limited to that shown in FIG. 3 as long as the mist can be sprayed.

The nozzle 100 shown in FIG. 3 is arranged around a columnar nozzle edge 1 having a sharp shape at one end and a columnar nozzle edge 1, and has a slit between the nozzle edge 1 and the slurry flow path 10. It is composed of a first ring member 2 to be formed and a second ring member 3 arranged around the first ring and forming a slit forming a gas flow path 20 with the first ring.

One end (upper end in the figure) of the nozzle edge 1 has a sharp shape, and one end (upper end in the figure) of the first ring member has a tapered shape so as to form a plane flush with the inclination of the sharp shape.
The slurry flow path 10 has a ring shape, and the slurry is ejected from the slurry injection port 11 in a ring shape. On the other hand, the gas flow path 20 also has a ring shape, and the air flow is ejected from the air flow injection port 21 in a ring shape. Here, one end of the first ring member has a tapered shape so as to form a plane flush with the sharp inclination of the nozzle edge 1. Therefore, the airflow ejected from the airflow injection port 21 at high speed causes the slurry ejected from the slurry injection port 11 to flow at high speed toward the tip of the nozzle edge and collide with the collision point 30, and causes the slurry to form a fine mist. Can be sprayed.
In the present embodiment, as shown in FIG. 3, the slurry is made into a fine mist by using a nozzle having a mechanism for generating mist by causing the slurry to flow by airflow from different directions and colliding with each other at a collision point. It is possible and preferable. In the cross-sectional view of FIG. 3, there are two airflow channels, but the present invention is not limited to this, and four airflow channels may exist in the cross section.

At this time, the injection flow rate of the slurry, the injection flow rate of the air flow, the flow rate of the air flow, and the like can be appropriately set according to the viscosity of the slurry, the particle size of the desired mist, and the like. The smaller the particle size of the mist, the smaller the particle size of the powder when dried. Therefore, the average particle size of the mist is preferably 30 μm or less, more preferably 20 μm or less, and 10 μm or less. Is more preferable. Even if fine mist is generated, if the slurry contains powder having a larger particle size, the powder does not become fine mist, and particles near the particle size of the powder are sprayed. To. The average particle size of the mist containing submicron order fine particles, for example, fine particle titanium oxide and fine particle zinc oxide is preferably 20 μm or less, more preferably 10 μm or less, and further preferably 5 μm or less. The average particle size of the mist can be calculated by enlarging an image taken by a high-speed camera or the like and measuring the average particle size of the major axis of 20 or more mists (droplets) on the screen. ..

The mist of the sprayed slurry is dried into dry particles and recovered. Generally, a high-temperature drying gas is used for drying, and the slurry becomes dry particles by spraying the drying gas at a temperature at which the solvent used evaporates onto the mist of the slurry. Although the dried particles are appropriately recovered, it is preferable to use a device capable of recovering the dried particles integrally with the sprayer and the dryer.

In the present embodiment, since the slurry is made into a mist and the mist is dried to obtain dried particles, the particle size of the dried dried particles can be finely controlled. In particular, when the fine particle powder is contained, the oily component can be coated on each of the fine particle powder, so that the usability is dramatically improved. In addition, when it is molded and solidified, its drop strength is significantly improved. Furthermore, since the functions of the powder can be maximized, for example, in the case of cosmetics containing fine particle titanium oxide, fine particle zinc oxide, etc., the SPF value is improved and other unpredictable effects are exhibited. It is a thing.

Specifically, the median diameter D _{50 of the} dried particles obtained by the spray drying step is preferably 20 μm or less, more preferably 17 μm or less, further preferably 13 μm or less, and 10 μm or less. You may. The medium diameter D ₅₀ can be measured by a laser diffraction type particle size distribution measuring device.
Further, in the cosmetic containing fine particle titanium oxide and / or fine particle zinc oxide, the particle size distribution of the dried particles obtained by the spray drying step preferably has a maximum value of 20 μm or less, and has a maximum value of 17 μm or less. It is more preferable to have a maximum value of 13 μm or less, and it may have a maximum value of 10 μm or less, and the maximum value is preferably derived from fine particles such as fine particle titanium oxide and fine particle zinc oxide.
In the case of molded powder cosmetics, the cosmetics are scraped off with a puff, the scraped cosmetics are classified with a 250 micron mesh, and the particle size of the cosmetics after the classification is measured. The particle size of the dry powder obtained by the spray drying step can be measured. The present inventors have confirmed that the particle size of the molded powder cosmetics measured by the above method and the particle size of the dry powder in the dry spraying step are substantially the same.

In the case of unmolded powder cosmetics such as loose powder, the particle size of the dried particles obtained by the spray drying step can be obtained by measuring the particle size as it is.
That is, another embodiment of the present invention is a loose powder containing at least fine particles having an average particle diameter of 10 μm or less and a loose powder containing an oily component having a medium diameter D ₅₀ of 20 μm or less. is there.
Further, among the pressed powder containing at least fine particles having an average particle diameter of 10 μm or less and the pressed powder containing an oily component, which is rubbed with a puff, the medium diameter D of the pressed powder of 250 μm mesh pass _A pressed powder in which ₅₀ is 20 μm or less.

<Molding process>
In the present embodiment, the molding step provided as desired is a step of filling a mold with the dry powder obtained in the spray drying step and molding. It may be a pressed powder by molding, or it may be a loose powder without molding. When the pressed powder is used, the feeling of use is preferable and the drop strength is improved. When used as a loose powder, the feeling of use is preferable.

Hereinafter, the present invention will be described in more detail by way of examples, but the technical scope of the present invention is not limited to the illustrated examples.

(Examples 1 to 4, Comparative Examples 1 to 4)
<Slurry preparation>
To 100 parts by mass of the total amount of powder and oil shown in Table 1, 120 parts by mass of pure water was added and stirred using a double planet mixer (DPM) to prepare a slurry.

<Spray drying>
The prepared slurry according to Examples 1 to 3 is sprayed with mist by a sprayer equipped with a nozzle having the structure shown in FIG. 3 at a flow rate of 4 g / min for spraying the slurry, and dried to obtain dried particles. Obtained. The median diameter D ₅₀ of the obtained dry particles was as shown in Table 1.
Further, dried particles were obtained from the prepared slurry according to Example 4 in the same manner as in Example 1 except that the flow velocity of the airflow for spraying the slurry was set to 8 g / min. The median diameter D ₅₀ of the obtained dry particles was as shown in Table 1. FIG. 1 shows the particle size distribution of the dry particles obtained in Example 1, and FIG. 2 shows the particle size distribution of the dry particles obtained in Example 4.
The dried particles were molded with a press to obtain a pressed powder.

The prepared slurry according to Comparative Examples 1 to 3 was filled in a container, compression-molded, and then dried to obtain a pressed powder.

The prepared slurry according to Comparative Example 4 was dried by an air flow dryer (a device for applying shearing force to the slurry by a rotating drum to form particles) to obtain dried particles. The median diameter D ₅₀ of the obtained dry particles was as shown in Table 1. The dried particles according to Comparative Example 4 were molded by a press machine to obtain a pressed powder.

<Evaluation>
The obtained pressed powder was evaluated according to the following items and evaluation criteria.
-Uniformity of spread and spread: 10 evaluators used pressed powder and evaluated.
⊚: 9 or more out of 10 responded that the spread and spread were uniform ○: 6 to 8 out of 10 responded that the spread and spread were uniform △: 3 to 5 out of 10 responded that the spread and spread were uniform Answered that there was ×: 0 to 2 out of 10 responded that the spread was uniform. ・ Softness of touch: 10 evaluators used pressed powder to evaluate.
⊚: 9 or more out of 10 responded that the feel was soft ○: 6 to 8 out of 10 responded that the feel was soft △: 3 to 5 out of 10 responded that the feel was soft ×: 0 out of 10 ~ 2 responded that the feel was soft ・ Powderiness of the finish: 10 evaluators used pressed powder and evaluated it.
⊚: 9 or more out of 10 responded that the finished product was not powdery ○: 6 to 8 out of 10 responded that the finished product was not powdery △: 3 to 5 out of 10 responded that the finished product was not powdery No powdery response ×: 0 to 2 out of 10 responded that the finished product was not powdery

-Drop strength: The state of each pressed powder after being dropped from a height of 50 cm onto a plywood having a thickness of 50 mm five times was evaluated based on the following evaluation criteria.
◎: No cracks or chips ○: Very slight cracks or chips on the surface △: Partial cracks or chips ×: Overall cracks or chips

-SPF effect: Each pressed powder is applied to a surgical tape (manufactured by Spectrum 3M Healthcare Co., Ltd.) with a loading amount of ² mg / cm ² in an area of 6.4 cm x 6.4 cm, and UV-2000S manufactured by Labsphere Co., Ltd. The SPF value was determined from the average defense spectrum obtained by measuring 10 times using an SPF analyzer. In Table 1, the relative values with the measured value of Example 1 as 1 are shown.

(Example 5 and Comparative Example 5)
<Slurry preparation>
A total of 100 parts by mass of the powder and oil shown in Table 2 was added to 120 parts by mass of pure water, and the mixture was stirred with a double planet mixer (DPM) to prepare a slurry.
<Spray drying>
The prepared slurry according to Example 5 was sprayed with mist by a nebulizer equipped with a nozzle having the structure shown in FIG. 3 and dried to obtain dried particles. The median diameter D ₅₀ of the obtained dry particles was as shown in Table 2.
Further, the obtained slurry was dried by an air flow dryer (a device for applying a shearing force to the slurry by a rotating drum to form particles) to obtain dried particles. The median diameter D ₅₀ of the obtained dry particles was as shown in Table 2.
The dried particles were used as loose powder as they were.

100 Nozzle 1 Nozzle edge 2 First ring member 3 Second ring member 10 Slurry flow path 11 Slurry injection port 20 Gas flow path 21 Gas injection port 30 Collision point

Claims (7)

Slurry preparation step of preparing a slurry cosmetic raw materials were mixed in a solvent comprising at least the powder and the oil component,
Spray drying and spray by atomizer mist slurry prepared above to obtain dry particles of the powder cosmetics by drying the mist that is the spray and,
A powder having a step of using the dry particles of the powder cosmetic as it is into a powder cosmetic (loose powder) or a molding step of filling the dry particles of the powder cosmetic into a mold to mold the powder cosmetic (pressed powder). It ’s a method of manufacturing cosmetics.
The atomizer used in the spray drying step is provided with a nozzle and sprays mist from the tip of the nozzle.
The nozzle is a nozzle having a mechanism for generating mist by causing the slurry to flow from different directions by an air flow and colliding the slurries with each other.
A method for producing powdered cosmetics, wherein the medium diameter D _{50 of the} dried particles obtained in the spray drying step is 20 μm or less. The method for producing a powdered cosmetic according to claim 1, wherein the powder contains at least a spherical powder. The method for producing a powder cosmetic according to claim 1 or 2, wherein the powder contains at least a composite powder in which fine particles are arranged around a plate-shaped powder. The method for producing a powdered cosmetic according to any one of claims 1 to 3, wherein the powdered cosmetic is a loose powder. The method for producing a powdered cosmetic according to any one of claims 1 to 3 , wherein the powdered cosmetic is a pressed powder. The powder cosmetic, the powder average particle size of at least the following fine particles 10 [mu] m, and a loose powder comprising an oil component, a median diameter D ₅₀ is 20μm or less, the powder cosmetic according to claim 4 How to make the charge. The powder cosmetic is a powder containing at least fine particles having an average particle diameter of 10 μm or less, and a pressed powder containing an oily component.
The method for producing a powder cosmetic according to claim 5 , wherein the median diameter D _{50 of} the pressed powder having a 250 μm mesh pass is 20 μm or less among the pressed powder scraped off by the puff.